CN112392450B - Layered and quantitative gas injection method and device for horizontal well - Google Patents
Layered and quantitative gas injection method and device for horizontal well Download PDFInfo
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- CN112392450B CN112392450B CN201910752020.7A CN201910752020A CN112392450B CN 112392450 B CN112392450 B CN 112392450B CN 201910752020 A CN201910752020 A CN 201910752020A CN 112392450 B CN112392450 B CN 112392450B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/066—Valve arrangements for boreholes or wells in wells electrically actuated
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Abstract
The invention provides a horizontal well layered quantitative gas injection method and a gas injection device, and relates to the field of oil field development, wherein the horizontal well layered quantitative gas injection method comprises the following steps: step 1, presetting a plurality of gas injection points in a horizontal well, wherein the plurality of gas injection points are sequentially arranged at intervals along a horizontal section of the horizontal well; step 2, installing an independently controllable gas injection device at each gas injection point; step 3, injecting gas into the stratum sequentially through a plurality of gas injection devices according to preset gas injection time and preset gas injection quantity; and 4, repeating the step 3 until the oil displacement process is finished. The layered quantitative gas injection method and the gas injection device for the horizontal well independently control gas to enter and exit at each gas injection point, and can inject gas into a specified oil reservoir part according to preset gas injection amount (design amount), so that the distribution effect of a gas injection wave and an area is improved.
Description
Technical Field
The invention relates to the field of oilfield development, in particular to a horizontal well layered quantitative gas injection method and a gas injection device.
Background
At present, the development of low-permeability and ultra-low-permeability oil reservoirs has become a requirement related to national energy safety, and conventional development methods are limited due to low permeability and large seepage resistance. Through years of research and practice, the most promising is the conventional gas injection technology and the gas injection technology combined with the horizontal well technology.
The conventional gas injection technology is generally vertical well injection and extraction, gas can well play a displacement role for a stratum with higher permeability, and the gas channeling phenomenon is prominent when the conventional gas injection technology is applied to an oil reservoir with low permeability. Once the gas breaks through the channels formed in the reservoir, the later injected gas will hardly exert the oil displacement effect, and the remaining oil saturation in the reservoir is very high, as shown in fig. 1, the lower the permeability or the more heterogeneous the oil is, the smaller the swept area is.
Aiming at the problem, a horizontal well gas injection technology is provided, and comprises two modes of horizontal well gas injection (gas) vertical well oil production (oil) and horizontal well gas injection (gas) horizontal well oil production (oil). The theoretical effect of the horizontal well gas injection (gas) horizontal well oil production (oil) technology is the best (as shown in fig. 2), and specifically, the injected gas of each horizontal section can effectively enlarge the swept volume and improve the oil displacement effect of the control section.
However, in the actual production process, due to the pressure distribution condition of the gas in the horizontal well section, the gas is injected into the root section of the horizontal well in a large amount, and the gas injection amount of the remote tip section is very small or even none, especially in a more heterogeneous oil reservoir (as shown in fig. 3), and the popularization and the implementation of the technology are limited due to the defect.
The above-mentioned non-uniform gas injection phenomenon is mainly due to the fact that gas is very sensitive to reservoir heterogeneity and the pressure of injected gas in long, straight horizontal section is difficult to stabilize. The phenomenon is less occurred during water injection, mainly the seepage resistance of water is larger than that of gas, the water injection amount is low, and the injected water is in a better isobaric stable state in a horizontal section pipeline. Generally, in a low permeability reservoir with 10m3 of daily water injection, the daily gas injection amount can reach 2000-10000 Nm < 3 > (normal pressure condition), the well depth is 2000m, the bottom hole flowing pressure is 10MPa, and the gas is converted to the underground by taking the bottom hole flowing pressure as a standard and is about 20-100 m < 3 >. Namely, the gas injection amount is 2 to 10 times of the water injection amount. While the viscosity of water is generally in the range of 0.5 to 0.8mpa.s and the gas viscosity (in the case of nitrogen) reservoir conditions are in the range of 0.02 to 0.05mpa.s.
As known from the Darcy formula, the pressure difference of the injected gas is obviously smaller than that of the injected gas when the flow is injected; when the pressure difference is close, the gas injection quantity is close to the water injection quantity by 10 times. Usually, the field is developed by adopting a large-flow injection mode, so that gas imbalance occurs in the horizontal section, and the gas turbulence phenomenon at the outlet position is serious. The flow distributed by the root outlet is large, and the gas pressure loss is large; the tip outlet dispenses a very low flow, see fig. 4.
Disclosure of Invention
The invention aims to provide a horizontal well layered quantitative gas injection method and a gas injection device, which can inject the gas into a specified oil reservoir part according to a preset gas injection quantity, and further improve the distribution effect of a gas injection wave area.
In order to achieve the purpose, the invention provides a horizontal well layered quantitative gas injection method, wherein the method comprises the following steps:
step 1, presetting a plurality of gas injection points in a horizontal well, wherein the plurality of gas injection points are sequentially arranged at intervals along a horizontal section of the horizontal well;
step 2, installing an independently controllable gas injection device at each gas injection point;
step 3, injecting gas into the stratum sequentially through a plurality of gas injection devices according to preset gas injection time and preset gas injection quantity;
and 4, repeating the step 3 until the oil displacement process is finished.
The horizontal well layered quantitative gas injection method comprises the step 1, wherein 3 gas injection points are preset in a horizontal section of the horizontal well, and from the root of the horizontal section to the tip of the horizontal section, the 3 gas injection points are respectively a first gas injection point, a second gas injection point and a third gas injection point.
The horizontal well stratified quantitative gas injection method as described above, wherein in step 3, the predetermined gas injection time for each gas injection point is the same.
The horizontal well stratified quantitative gas injection method as described above, wherein in step 3, the predetermined amount of gas injection by the gas injection apparatus at the first gas injection point is greater than the predetermined amount of gas injection by the gas injection apparatus at the second gas injection point; the predetermined amount of gas injection by the gas injection device at the second gas injection point is greater than the predetermined amount of gas injection by the gas injection device at the third gas injection point.
The horizontal well layered quantitative gas injection method comprises the step of connecting a first packer, a gas injection valve and a second packer in series.
The layered quantitative gas injection method for the horizontal well comprises the step of injecting gas into the horizontal well through a gas injection valve.
The layered quantitative gas injection method for the horizontal well comprises the steps that the gas injection valve comprises a valve body, a valve core and an independently controllable driving mechanism, the valve body is provided with a valve cavity which is communicated along the axial direction of the valve body, the valve cavity is conical, at least one through hole is formed in the valve body, one end of the through hole is formed in the inner wall of the valve cavity, the other end of the through hole is formed in the outer wall of the valve body, the valve core is conical and can be in sealing fit with the inner wall of the valve cavity, one end of the valve core is inserted into the valve cavity, the other end of the valve core is connected with an electrically controlled driving mechanism, and the electrically controlled driving mechanism drives the valve core to reciprocate along the axial direction of the valve cavity.
The invention also provides a gas injection device which is arranged at the horizontal section of the horizontal well and used for injecting gas into the stratum within preset gas injection time and preset gas injection quantity, wherein the gas injection device comprises a first packer, a gas injection valve and a second separator which are connected in series, the gas injection valve comprises a valve body, a valve core and a driving mechanism, the valve body is provided with a valve cavity which is communicated along the axial direction of the valve body, a communicating pipe is arranged in the valve cavity, the communicating pipe is arranged along the radial direction of the valve cavity, two ends of the communicating pipe are respectively and fixedly connected on the valve body, the side wall of the communicating pipe is provided with a gas inlet, the side wall of the gas inlet is conical, a through hole is further formed in the communicating pipe, one end of the through hole is formed in the side wall of the gas inlet, the other end of the through hole is formed in the outer wall of the valve body, the valve core is conical and can be in sealing fit with the side wall of the gas inlet, one end of the valve core is inserted into the gas inlet, the other end of the valve core is connected with the driving mechanism which can be independently controlled, and the driving mechanism drives the valve core to reciprocate along the axial direction of the gas inlet.
The gas injection device comprises a valve cavity, a gas inlet, a valve core, two valve rods, two guide frames and two guide frames, wherein the valve rods are arranged at two ends of the valve core respectively, the valve rods extend into the valve cavity along the axial direction of the gas inlet respectively, and the guide frames are correspondingly arranged in the valve cavity and guide the corresponding valve rods to reciprocate along the axis of the gas inlet.
The gas injection device as described above, wherein the guiding frame includes a guiding bearing and a guiding pillar for supporting the guiding bearing, the guiding bearing is sleeved outside the valve rod and is in sliding fit with the valve rod, one end of the guiding pillar is fixedly arranged on the inner wall of the mounting cavity, and the other end of the guiding pillar is fixedly arranged on the outer wall of the guiding bearing.
The gas injection apparatus according to the above, wherein the drive mechanism is an electrically controlled drive mechanism and is provided on the valve stem at the end of the valve element that is expanded in diameter, the electrically controlled drive mechanism includes a first electromagnet, a spring, and a second electromagnet that are connected in this order, first electromagnet and second electromagnet all are connected with the power cord, first electromagnet is fixed the tip of valve rod, the spring with the second electromagnet cover is established on the valve rod, second electromagnet fixed connection is in on the leading truck.
Compared with the prior art, the invention has the following characteristics and advantages:
according to the layered and quantitative gas injection method and the gas injection device for the horizontal well, the gas injection device capable of being independently controlled is installed on each gas injection point (outlet) of the horizontal section, so that gas can be independently controlled to enter and exit at each gas injection point, the gas can be injected into a specified oil reservoir part according to the preset gas injection amount (design amount), the distribution effect of a gas injection wave and an area is further improved, the gas is uniformly distributed in a stratum, the gas channeling phenomenon is avoided, and the yield of the horizontal well is finally improved.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.
FIG. 1 is a diagram showing the effect of gas distribution in a vertical well injection-production mode;
FIG. 2 is a diagram of theoretical gas distribution effect of horizontal well injection-production mode;
FIG. 3 is a diagram of the actual gas distribution effect of the horizontal well injection-production mode;
FIG. 4 is a schematic view of gas flow in the horizontal section during gas injection;
FIG. 5 is a schematic diagram (one) of a horizontal well stratified quantitative gas injection method according to the present invention;
FIG. 6 is a schematic diagram (two) of a horizontal well stratified quantitative gas injection method provided by the invention;
FIG. 7 is a schematic diagram (III) of a horizontal well stratified quantitative gas injection method proposed by the present invention;
FIG. 8 is a schematic diagram (IV) of a horizontal well stratified quantitative gas injection method proposed by the present invention;
FIG. 9 is a schematic diagram of the gas flow state of the horizontal well stratified quantitative gas injection method according to the present invention;
FIG. 10 is a schematic view of the structure of a gas injection apparatus according to the present invention;
FIG. 11 is a sectional view showing the position of the guide frame of the gas injection apparatus according to the present invention.
Description of the reference numerals:
100. horizontal wells; 110. A vertical section;
120. a horizontal segment; 121. A root portion;
122. a tip portion; 10. A gas injection point;
11. a first gas injection point; 12. A second gas injection point;
13. a third gas injection point; 200. A gas injection device;
210. a first packer; 211. A rubber cylinder;
220. an air injection valve; 221. A valve body;
222. a valve core; 223. A drive mechanism;
224. a valve cavity; 225. A through hole;
226. an air inlet; 227. A valve stem;
228. a guide frame; 229. A communicating pipe;
230. a second packer; 231. A rubber cylinder;
300. a vertical well; 400. A swept area;
500. an unswept region; 1. A first electromagnet;
2. a spring; 3. A second electromagnet;
4. a guide bearing; 5. A guide pillar;
6. a power line.
Detailed Description
The details of the present invention will become more apparent in light of the accompanying drawings and description of specific embodiments thereof. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.
As shown in fig. 5 to 11, the present invention provides a horizontal well stratified quantitative gas injection method, wherein a horizontal well 100 has a vertical section 110 and a horizontal section 120, the method comprising:
step 1, presetting a plurality of gas injection points in a horizontal well 100, wherein the plurality of gas injection points are sequentially arranged at intervals in a horizontal section 120;
step 2, installing an independently controllable gas injection device 200 at each gas injection point;
step 3, injecting gas into the corresponding stratum in sequence by a plurality of gas injection devices 200 according to preset gas injection time and preset gas injection quantity;
and 4, repeating the step 3 until the oil displacement process is finished.
According to the layered quantitative gas injection method for the horizontal well, the gas injection device 200 capable of being independently controlled is installed on each gas injection point (outlet) of the horizontal section 120, so that gas can be independently controlled to enter and exit from each gas injection point, and can be injected into a specified oil reservoir part according to the preset gas injection amount (design amount), and further, the distribution effect of a gas injection wave area is improved, so that the gas is uniformly distributed in a stratum, the gas channeling phenomenon is avoided, and the yield of the horizontal well is finally improved.
In an alternative example of the present invention, in step 1, 3 gas injection points are preset in the horizontal segment 120, and 3 gas injection points from the root 121 of the horizontal segment 120 to the tip 122 of the horizontal segment 120 are the first gas injection point 11, the second gas injection point 12 and the third gas injection point 13, respectively. It should be noted that the number and the positions of the gas injection points are designed by a reservoir engineer according to reservoir development conditions and requirements, which is the prior art and will not be described herein.
In an alternative example of the present invention, in step 3, the predetermined gas injection time is the same for each gas injection point. In an alternative example, the predetermined injection time is 10 days, i.e., 10 days for each gas injection apparatus 200 to inject gas into the formation.
In an alternative example of the present invention, in step 3, the predetermined amount of gas injection by the gas injection apparatus 200 at the first gas injection point 11 is larger than the predetermined amount of gas injection by the gas injection apparatus 200 at the second gas injection point 12; the predetermined amount of gas injection by the gas injection apparatus 200 at the second gas injection point 12 is greater than the predetermined amount of gas injection by the gas injection apparatus 200 at the third gas injection point 13. In an alternative example, the predetermined daily gas injection amount of the gas injection apparatus 200 at the first gas injection point 11 is 80m 3 (cubic meter); the predetermined daily gas injection amount of the gas injection apparatus 200 at the second gas injection point 12 is 60m 3 (ii) a The predetermined daily gas injection amount of the gas injection apparatus 200 at the third gas injection point 13 is 40m 3 。
Specifically, first, the gas injection apparatus 200 at the first gas injection point 11 injects gas in an amount of 80m per day 3 Injecting for 10 days; thereafter, the gas injection apparatus 200 located at the second gas injection point 12 injects gas for 60m 3 Injecting for 10 days; finally, the gas injection apparatus 200 at the third gas injection point 13 injects gas for a daily gas injection amount of 40m 3 Injecting for 10 days; finally realizing the monthly notes of 1800m 3 . Although the total injection amount is the same as that of the conventional method, the distribution of swept areas in the formation is more uniform at three injection points (the first injection point 11, the second injection point 12, and the third injection point 13), as shown in fig. 5 to 8, according to the present inventionThe swept area and efficiency formed in the stratum by the horizontal well layering quantitative gas injection method can reach an ideal state.
In the present invention, the gas injection amount and the gas injection time of each gas injection point are also designed by the reservoir engineer according to the reservoir development conditions and requirements, which is the prior art and will not be described herein.
In the present invention, the gas injection apparatus 200 comprises a first packer 210, a gas injection valve 220, and a second packer 230 connected in series, wherein the gas injection valve 220 can be independently switched.
Preferably, the gas injection valve 220 is an electrically controlled gas injection valve capable of being opened and closed independently.
In an alternative example of the present invention, as shown in fig. 9, 10, and 11, the gas injection valve 220 includes a valve body 221, a valve core 222, and a driving mechanism 223, the valve body 221 is cylindrical and has a valve cavity 224 penetrating through the valve body 221 in an axial direction, a connection pipe 229 is fixedly disposed in the valve cavity 224, the connection pipe 229 is disposed along a radial direction of the valve cavity 224, two ends of the connection pipe 229 are fixedly connected to a side wall of the valve cavity 224, a gas inlet 226 is disposed on a side wall of the connection pipe 229, a side wall of the gas inlet 226 is tapered, the connection pipe 229 is further disposed with a through hole 225, one end of the through hole 225 is disposed on a side wall of the gas inlet 226, the other end of the through hole 225 is disposed on an outer wall of the valve body 221, the valve core 222 is tapered and can be in sealing fit with the side wall of the gas inlet 226, one end of the valve core 222 is inserted into the gas inlet 226, the other end of the valve core 222 is connected with the driving mechanism 223 capable of being independently controlled, and the driving mechanism 223 drives the valve core 22 to reciprocate along the axial direction of the gas inlet 226. Thus, when the driving mechanism 223 drives the valve core 222 to abut against the side wall of the gas inlet 226, the through hole 225 is closed, and the gas inlet 226 is isolated from the stratum (the valve cavity 224 is isolated from the stratum), so that gas cannot enter the stratum; when the driving mechanism 223 drives the valve plug 222 away from the side wall of the gas inlet 226, the through hole 225 is opened, the gas inlet 226 is communicated with the ground layer, and gas enters the ground layer through the through hole 225.
In an optional example of the present invention, two ends of the valve core 222 are respectively provided with a valve rod 227, the valve rods 227 are arranged along the axial direction of the air inlet 226 and respectively extend into the valve cavity 224, two guide frames 228 are correspondingly arranged in the valve cavity 224, and the guide frames 228 guide the corresponding valve rods 227 to reciprocate along the axis of the air inlet 226, so as to ensure that the valve core 223 can always move along the axis of the air inlet 226, thereby forming precise matching, and further realizing smooth opening and closing of the air inlet 226.
In an alternative embodiment of the present invention, the stem 227 and the valve core 222 are integrally formed, and the stem 227 is restrained by the guide bracket 228 for stable axial movement.
In an alternative example of the present invention, as shown in fig. 11, the guiding frame 228 includes a guiding bearing 4 and a guiding support post 5 for supporting the guiding bearing 4, the guiding bearing 4 is sleeved outside the valve rod 227 and is in sliding fit with the valve rod 227, one end of the guiding support post 5 is fixed on the inner wall of the valve cavity 224, and the other end of the guiding support post 5 is fixed on the outer wall of the guiding bearing 4.
In an alternative example, the guide frame 228 includes two guide struts 5, and the two guide struts 5 are symmetrically disposed on both sides of the guide bearing 4.
In an alternative example of the present invention, as shown in fig. 10, the driving mechanism 223 is an electrically controlled driving mechanism and is disposed on a valve stem 227, the driving mechanism 223 includes a first electromagnet 1, a spring 2 and a second electromagnet 3 which are connected in sequence, the first electromagnet 1 and the second electromagnet 2 are both connected with a power cord 6, the first electromagnet 1 is fixed on the end of the valve stem 227, the spring 2 and the second electromagnet 3 are sleeved on the valve stem 227, and the second electromagnet 3 is fixedly connected with the guide frame 228. In this way, after the first electromagnet 1 and the second electromagnet 2 are energized, they attract each other, and then overcome the elasticity of the spring 2, the first electromagnet 1 moves toward the second electromagnet 3, and at the same time, drives the valve core 222 phase gas inlet 226 to move, closes the gas inlet 226, the gas no longer enters the formation, but flows from the other outlets of the valve cavity 224 phase; after the first electromagnet 1 and the second electromagnet 2 are powered off, under the action of the elastic restoring force of the spring 2, the first electromagnet 1 is far away from the second electromagnet 3, and simultaneously, the valve core 222 is driven to be far away from the air inlet 226, so that the air inlet 226 is opened. The power line 6 is connected to the position of a well head in a shaft after insulation protection, so that the action of the electromagnet is controlled on the ground, and finally, the opening and the closing of the gas injection valve 220 can be independently controlled. Because the driving mechanism 223 adopts an electric control mode and is operated on the ground in a wired mode, the control quality of the whole gas injection device 200 is ensured.
In the present invention, the gas injection apparatus 200 can be deployed in multiple stages within the horizontal well 100.
In an alternative example of the present invention, since the gas injection apparatus 200 is applied to a horizontal section, the load-bearing capacity of the pipe string is not strong, and both the first packer 210 and the second packer 230 are Y45 type packers, and the setting is achieved by using the rubber cylinders 211 and 213, which will not be described in detail. Of course, those skilled in the art can select the existing packers with other specifications according to actual needs.
The detailed working process of the horizontal well stratified quantitative gas injection method and device 200 according to the present invention will now be described in detail with reference to fig. 5 to 11:
firstly, step 1 is carried out, according to the design of a shaft, a first gas injection point 11, a second gas injection point 12 and a third gas injection point 13 are preset in a horizontal well, and the first gas injection point 11, the second gas injection point 12 and the third gas injection point 13 are sequentially arranged at intervals from the root 121 to the tip 122 of the horizontal section 120;
thereafter, step 2 is performed to sequentially lay out and install the gas injection apparatus 200 at the gas injection positions (the first gas injection point 11, the second gas injection point 12, and the third gas injection point 13). After installation, the first packer 210 and the second packer 230 of the gas injection apparatus 200 both seal the casing, i.e. the gas in the horizontal oil pipe can only enter the casing through the gas injection valve 220 of the gas injection apparatus 200 and then enter the formation (oil layer).
Thereafter, step 3 is performed in which 3 gas injection apparatuses 200 are operated in stages in the order from the root 121 to the tip 122. That is, only the gas injection apparatus 200 at the first gas injection point 11 is turned on to inject gas in an amount of 80m per day 3 Injecting for 10 days; subsequently, the gas injection apparatus 200 at the first gas injection point 11 is closed. At this time, as shown in fig. 5, the gas injection region (swept region) is concentrated near the gas injection apparatus 200 at the first gas injection point 11;
then, only the gas injection apparatus 200 at the second gas injection point 12 was turned on for a daily gas injection amount of 60m 3 Injecting for 10 days; subsequently, the gas injection apparatus 200 at the second gas injection point 12 is closed. At this time, as shown in FIG. 6, the gas injection apparatus 200 at the second gas injection point 12 is attachedA certain gas injection area is formed; and the gas near the gas injection apparatus 200 at the first gas injection point 11 expands to the surroundings, naturally adjusting;
thereafter, only the gas injection apparatus 200 at the third gas injection point 13 was turned on for a daily gas injection amount of 40m 3 Injecting for 10 days; subsequently, the gas injection apparatus 200 at the third gas injection point 13 is closed. As shown in FIG. 7, a certain gas injection region is also formed near the gas injection apparatus 200 at the third gas injection point 13; and the gas in the vicinity of the gas injection apparatus 200 at the first gas injection point 11 and the gas injection apparatus 200 at the second gas injection point 12 both expand circumferentially and are naturally adjusted. Finally, as shown in fig. 8, this adjustment process avoids high flow rates during gas injection, which is beneficial for the effect of the gas expanding the swept volume.
And finally, repeating the step 3, and implementing multiple rounds of injection, wherein the injection amount and the period of the injection device 200 can be adjusted by each injection until the oil displacement process is finished.
After the horizontal well layered quantitative gas injection method provided by the invention is implemented, the gas sweep efficiency between the two sections of horizontal wells 100 can reach an ideal state.
The layered quantitative gas injection method for the horizontal well can be used in both an injection well and a production well, wherein the layered quantitative gas injection method is most economical to use in the injection well, and has obvious comprehensive effects.
The horizontal well layered quantitative gas injection method and the gas injection device provided by the invention are suitable for being used in a low-permeability reservoir, and further provide guidance for a development control mode of the low-permeability reservoir.
The foregoing embodiments are described in detail for the purpose of illustrating the invention and are not to be construed as limiting the invention in any way, but for the purpose of limiting the invention in any way, and in particular, various features described in different embodiments can be combined with one another as desired to form other embodiments, unless explicitly stated to the contrary, which features are to be understood as being applicable to any one embodiment and not limited to only the described embodiments.
Claims (9)
1. A horizontal well stratified quantitative gas injection method is characterized by comprising the following steps:
step 1, presetting a plurality of gas injection points in a horizontal well, wherein the plurality of gas injection points are sequentially arranged at intervals along a horizontal section of the horizontal well;
step 2, installing an independently controllable gas injection device on each gas injection point; the gas injection device comprises a first packer, a gas injection valve and a second packer which are connected in series, the gas injection valve comprises a valve body, a valve core and an independently controlled driving mechanism, the valve body is provided with a valve cavity which is communicated along the axial direction of the valve body, the valve cavity is conical, the valve body is provided with at least one through hole, one end of the through hole is arranged on the inner wall of the valve body, the other end of the through hole is arranged on the outer wall of the valve body, the valve core is conical and can be in sealing fit with the inner wall of the valve body, one end of the valve core is inserted into the valve cavity, the other end of the valve core is connected with the driving mechanism, and the driving mechanism drives the valve core to reciprocate along the axial direction of the valve cavity;
step 3, injecting gas into the stratum sequentially in preset gas injection time and preset gas injection amount through a plurality of gas injection devices respectively;
and 4, repeating the step 3 until the oil displacement process is finished.
2. The horizontal well layered quantitative gas injection method according to claim 1, wherein in step 1, 3 gas injection points are preset in a horizontal section of the horizontal well, from a root of the horizontal section to a tip of the horizontal section, and the 3 gas injection points are respectively a first gas injection point, a second gas injection point and a third gas injection point.
3. The horizontal well stratified quantitative gas injection method according to claim 2, wherein in step 3, the predetermined gas injection time at each gas injection point is the same.
4. The horizontal well stratified quantitative gas injection method according to claim 3, wherein in step 3, the predetermined amount of gas injection by the gas injection means at the first gas injection point is greater than the predetermined amount of gas injection by the gas injection means at the second gas injection point; the predetermined amount of gas injection by the gas injection apparatus at the second gas injection point is greater than the predetermined amount of gas injection by the gas injection apparatus at the third gas injection point.
5. The horizontal well stratified quantitative gas injection method according to claim 1, wherein the gas injection valve is an electronic control gas injection valve.
6. The utility model provides a gas injection device, installs the horizontal segment at the horizontal well for with predetermined gas injection time and predetermined gas injection volume gas injection in to the stratum, a serial communication port, gas injection device includes series connection's first packer, gas injection valve and second separator, the gas injection valve includes valve body, case and actuating mechanism, the valve body has the edge the valve pocket that the axial of valve body link up, be equipped with communicating pipe in the valve pocket, the communicating pipe is followed the radial setting of valve pocket just both ends rigid coupling respectively of communicating pipe are in on the valve body, the air inlet has been seted up on the lateral wall of communicating pipe, the lateral wall of air inlet is the toper, the perforating hole has still been seted up in the communicating pipe, the one end of perforating hole is seted up on the lateral wall of air inlet, the other end of perforating hole is seted up on the outer wall of valve body, the case be the toper and can with the lateral wall seal cooperation of air inlet, the one end of case is inserted in the air inlet, the other end of case is connected with independently controlled actuating mechanism, the actuating mechanism drive the case is followed the axial reciprocating motion of air inlet.
7. The gas injection apparatus according to claim 6, wherein two ends of the valve core are respectively provided with a valve rod, the valve rods are respectively extended into the valve cavity along the axial direction of the gas inlet, and two corresponding guide frames are correspondingly arranged in the valve cavity and guide the corresponding valve rods to reciprocate along the axis of the gas inlet.
8. The gas injection apparatus of claim 7, wherein the guide frame comprises a guide bearing and a guide support for supporting the guide bearing, the guide bearing is fitted over the valve stem and slidably engaged with the valve stem, one end of the guide support is fixed to an inner wall of the valve body, and the other end of the guide support is fixed to an outer wall of the guide bearing.
9. The gas injection apparatus of claim 7, wherein the actuating mechanism is an electrically controlled actuating mechanism and is disposed on the valve stem at one end of the valve element at which the diameter of the valve element is expanded, the electrically controlled actuating mechanism includes a first electromagnet, a spring, and a second electromagnet connected in series, the first electromagnet is fixed to the end of the valve stem, the spring and the second electromagnet are fitted over the valve stem, and the second electromagnet is fixedly connected to the guide frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910752020.7A CN112392450B (en) | 2019-08-15 | 2019-08-15 | Layered and quantitative gas injection method and device for horizontal well |
Applications Claiming Priority (1)
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